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VietNam War - "Son Tay Raider" - GAU-5/A/A - XM177 - CAR15 nylon sling

Based on the sling used in the above raid during the VietNam War, this is not much more than a nylon GP strap with some added 550-cord loops.
 
While a basic design, it does a great job of taking the weight of the carbine due to the wide strap, plus it keeps the gun the correct way up!

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More details to follow